[tex]x=2,(9)\\10x=29,(9)\\10x-x=29,(9)-2,(9)\\9x=27\\x=3\in\mathbb{N}[/tex]
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[tex]x=2,(9)\\10x=29,(9)\\10x-x=29,(9)-2,(9)\\9x=27\\x=3\in\mathbb{N}[/tex]